Stevia and natural contraceptive?

Has anybody ever heard of stevia being a natural contraceptive? Someone posted on a fb group I belong to about her struggles with trying to conceive. Someone responded to her post about using stevia and that it was a natural contraceptive and she said she uses it every day. I use stevia every day in my coffee too. We have been trying for a few months. We got pregnant right away with my first and this time it's taking a bit longer. I know people try for years to conceive and I've only been trying for a few months so I'm not complaining or necessarily worried yet but just curious if anybody else has heard of this before?